FSANZ has completed an assessment of the potential public health and safety risk posed by malachite and leucomalachite green residues in Australian farmed and imported fresh fish. Malachite green has been tested in long-term studies in experimental animals – in these studies, there is some equivocal evidence of carcinogenicity in mice at high dose levels. The available data do not indicate that malachite green presents a carcinogenic risk for humans. At the very low dose levels detected in fish (less than 0.14 milligrams per kilogram), the public health and safety risk is considered to be very low.